Discerning enhanced dislocation plasticity in hydrogen-charged α-iron nano-crystals

Malik Wagih; Yizhe Tang; Tarek Hatem; Jaafar A. El-Awady

doi:10.1080/21663831.2015.1052889

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Discerning enhanced dislocation plasticity in hydrogen-charged α-iron nano-crystals

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- Discerning enhanced dislocation plasticity in hydrogen-charged α-iron nano-crystals
- Materials Research Letters Vol. 3, Issue 4, Pages: 184-189(2015)
- 作者机构：
  
  1. Department of Mechanical Engineering The British University in Egypt
  2. Department of Mechanical Engineering Johns Hopkins University Baltimore 18 USA,MD212
  3. Shanghai Institute of Applied Mathematics and Mechanics Shanghai University
  4. Department of Mechanical Engineering The British University in Egypt Cairo Egypt
  5. Department of Microstructure Physics and Alloy Design Max-Planck-Institut fuer Eisenforschung GmbH
  6. Department of Mechanical Engineering Johns Hopkins University Baltimore
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2015.1052889
  CLC：
- Online First：02 June 2015，
  
  Published：2015
- 稿件说明：
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Malik Wagih, Yizhe Tang, Tarek Hatem, et al. Discerning enhanced dislocation plasticity in hydrogen-charged α-iron nano-crystals[J]. Materials Research Letters, 2015, 3(4): 184-189.
DOI：

Malik Wagih, Yizhe Tang, Tarek Hatem, et al. Discerning enhanced dislocation plasticity in hydrogen-charged α-iron nano-crystals[J]. Materials Research Letters, 2015, 3(4): 184-189. DOI： 10.1080/21663831.2015.1052889.

摘要

Abstract

Novel atomistic simulations of

-iron nano-crystals starting with pre-existing dislocation networks have been performed to identify the effect of high hydrogen concentrations on enhanced dislocation plasticity. Hydrogen is shown to decrease the dislocations free-surface nucleation stress

as well as increase the flow strength of crystals. The dislocation density is observed to increase in the presence of hydrogen due to dislocation pinning and enhanced dislocation self-multiplications. Hydrogen also changes the deformation morphology from discrete slip planes in hydrogen-free crystals to a homogeneous deformation in H-charged crystals due to the enhanced dislocations self-multiplication.

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